Abstract

The effect of components of ceramics in the Sm₂O₃–Y₂O₃–HfO₂ system on their thermophysical properties was studied. It was shown that the most stable materials at 1400°C are ternary ceramics in the system under investigation that contain ≤12.5 mol % Sm₂O₃; the thermal conductivity of these materials does not exceed 1.3 W/(m K). Increasing samarium oxide content in samples in the Sm₂O₃–Y₂O₃–HfO₂ system was found to lead to significant changes in phase equilibria at temperatures ≥1000°C. The effect of the contents of individual components of the studied ceramics on the thermal conductivity and the linear thermal expansion coefficient, which largely determine the suitability of a ceramic material for using in a thermal barrier coating. It was shown that the addition to 12.5 mol % samarium oxide ensures the stability of the linear thermal expansion coefficient at acceptable values of the thermal conductivity of 0.8–1.6 W/(m K).

中文翻译：

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Sm 2 O 3 -Y 2 O 3 -HfO 2体系中用于发展有前景的热障涂层的陶瓷的理化性质研究

摘要

研究了Sm ₂ O ₃ –Y ₂ O ₃ –HfO ₂体系中陶瓷成分对它们的热物理性质的影响。结果表明，在1400°C下最稳定的材料是所研究体系中的三元陶瓷，其含量≤12.5 mol％Sm ₂ O ₃。这些材料的导热率不超过1.3 W /（m K）。Sm ₂ O ₃ –Y ₂ O ₃ –HfO ₂中样品中氧化sa的含量增加发现在≥1000°C的温度下，系统会导致相平衡发生重大变化。所研究陶瓷的各个成分的含量对热导率和线性热膨胀系数的影响，在很大程度上决定了陶瓷材料在热障涂层中的适用性。结果表明，在12.5 mol％的氧化mar中添加可确保线性热膨胀系数的稳定性在可接受的0.8-1.6 W /（m K）的导热系数下。